Summary For auditory integration (AI) therapy, the largest body of literature relates to its use in autism. Several systematic reviews of AI therapy in the treatment of autism found limited evidence to support its use. No comparative studies were identified that evaluated the use of AI therapy for other conditions.
The actual cost to install a gas fireplace may vary depending on your location, the product selected, complexity of the installation process, additional accessories purchased, and other options. 1  Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 2  Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation.
1 A natural stone fireplace might cost $2,500 to $3,500, while a stone veneer fireplace costs about 25% less (or $1,875 to $2,625). 2  If you plan on using gas burning logs in the fireplace, add $750 to $1,000 for a gas log kit. Should the new fireplace be incapable of connecting to an existing chimney (a relatively inexpensive project), you may have to install a new chimney at a cost of $60 to $100 per linear foot for an engineered (or metal) chimney or $100 to $200 per linear foot for a masonry chimney.